earticle

영어

Oligo- or polysaccharides produced by environmental microbes such as Rhizobium meliloti, Xanthomonas oryzae and Zoogloea ramigera have shown physico-chemically novel functions such as solubilizer, chiral selector, catalyst, and morphology-directing agent. To investigate these functions, the microbial carbohydrates were purified with some column chromatographies and the purities of the saccharides were checked with nuclear magnetic resonance (NMR) and/or Infrared (IR) spectroscopy. Cyclic oligosaccharides produced by R. meliloti, cyclic -1,2-glucans (cyclosophoraoses), acted as a solubility enhancer for poorly soluble molecules, a chiral solvating agent for many enantiomers in NMR and capillary electrophoresis (CE), and a morphology-directing agent for the synthesis of Se nanowires in water. □-Cyclosophorohexadecaose (□-C16) produced by X. oryzae and Rhizobial succinoglycan octasaccharides having acetyl, pyruvyl, and/or succinyl groups as substituents, acted as catalysts for the multicomponent Strecker reaction using trimethylsilylcyanide (TMSCN) in the mixture solutions of methanol and water. Also, Rhizobial cyclosophoraose and an extracellular polysaccharide produced by Z. ramigera, zooglan, acted as catalysts for the methanolysis of oxazolone compounds and phospholipids. These functions could be due to complexing capacities or strong hydrogen bonding abilities of the microbial carbohydrates.